Liner pulling device



/N vf/v To@ CLARf/vci WH/rf; OL/ VfR 5. GRA HAM @Y #ARR/J, MECH, F057' Ra HAR/N5 Patente-d May 12, 1942 UNITED STATES PATINT `OFFICE.

2,2%,629 Y v LINER PULLING DEVICE Clarence White', `Walnut 1-1ark, andOliver B. .i Graham, Los Angeles, Califassignors to Oil WellManufacturing Corporation, Los Angeles, j Calif., a corporation ofCalifornia i Application December 15, 1939, serial No. 309,374

4 claims. (co1. 2er-38.2)

Our invention relates to devices for pulling an linsert member from abore. The device andthe equivalent embodiments thereof are adapted forpulling various pieces of equipment from oil well pump tubing, such asvalves .and liners, and for f .pulling the liner from the bore of aslush pump.

It is in connection with the latter use that we have illustrated thedevice in the drawing. It Vshould be understood, however, that we do notintend the scope ofthe invention to be limited .to use in connectionwith slush pumps or for use solely in pulling liners from pumps, thisembodiment being chosen for the purposes of illustration anddescription,

It is one of the objects of our invention to prof vide a device operablefrom the exterior of a body .such as a slush pump to `engage an insert'member in a bore within the body such as a cylinder, and

.particularly a cylinder liner having a Yrelatively vthin wall, thedevice being operable to exert forces sulicient to break the liner loosefrom the Abore in which it is inserted and to withdraw the linertherefrom.

. .It is another object of our invention to provide a device of th'echaracter mentioned which in- `cludes a pulling mechanism comprisingseveral -separate members which will not .become mutually disengaged inthe operation of the device.

It is another object of our invention to provide a device of thecharacter mentioned which includes a grasping mechanism of a relativelyfew strong parts which will positively engage both the bore and theinner end face of a liner or other insert, and particularly a liner orinsert having a 'relatively thin Wall, the grasping device having itsparts assembled upon and interlocked with -the pulling mechanism.

These and other objects and features of our invention will be apparentfrom a perusal of the following part of the specification in connectionwith the accompanying drawing and the appended claims.

- In the drawing:

Fig. 1 is a longitudinal fragmentary section through a cylinder such asth'e cylinder of a slush pump, and illustrates the manner in which thedevice embodying the features of our invention is installed for theoperation of pulling a relatively thin liner from a pump cylinder.

. Fig. 2 is a cross section of the pulling device r taken along the-line2-2 of Fig. 1. i

Fig. 3 is a cross section of the pulling device taken along the line 3-3of Fig. 1.

Fig. 4 is a longitudinal fragmentary section .similar to Fig. l, showingthe grasping mecha- `nismincolla'psed position in which it is adapted.

for the step of inserting it within the cylinder.

In Fig. 1 of the drawing, the grasping mecha- Y .nism is shown inposition `ready to pull a liner from a cylinder. Thenumeral indicatesthe pump body having a bore |2 therein. An insert liner I3 in the formof a sleeve provides a pump cylinder bore` |4.. The pump body is Yformedried by a pullerbolt or stem 2| and a means for '.28 which engages thebolt 2| and imparting longitudinal movement to the bolt 2|, which meansis generally indicated on the drawing by the numeral 23.

A grip expanding nut 24 having a frustro-conical rim surface |6 isthreaded upon the `puller `bolt 2| withits small end |'l facing towardthe opening |5, The larger end 26 is disposed adjacent the inner.` endof the puller bolt 2| and is diametrallyslotted at 21 to receive .acotterfpin prevents the nut 24 from turning thereon.

:A plurality of segmental expanding gripsl 2,9

are .circumferentially spaced about the nut 24. Each of these gripsconstitutes the segment of a ring, and eachtwo, grips areV separated bya radially disposed gap 3U. The inner bore surface 3|v of each grip 29is conically shaped to lit the conical rim'surfacey I6 of the nut 24.Each of the-grips '29 is also machined to present a segment 32 of acylindrical surface diametered to slidably t Within the bore |4 of theliner I3, a V ,segment 33 of a cylindricalsurface of larger di- .ameterVthan that of the segment 32, and a seg- -ment 34Y of a cylindricalsurface of smaller diameter than that of the segment 32.

The'vcylindrical segment 33 at the inner end of 'the grip 29 lprovidesan annular shoulder 35 adapted `to engage the innerend of the liner '|3.The cylindrical'segment 33 is of thesame or Apreferablyofv somewhatsmaller diameter thanV theoutside diameter-of the liner |3,` enablingthe grips 29 when in Aexpanded position to be withj drawn through thebore of the pump body andyet have a maximum contactual surfaceengagement with the inner end 36 of the liner. I3.`

Between the cylindrical segments 32 and -`34 of'each' grip :29is'acircumferential groovev 3l which extends radially inwardly from the web4I and projects into and has annular sliding engagement with the sidewalls of the .grooves 31. The length of the web 4I' is s uch that theposition of the flange 42 within the side walls' ofthe groove 31 permitsendwise contact between the faces 39 and 40. s

A cylindrical socket wrench 43 is concentrithis application is notconcerned with the details of construction of the means 23, reference isherein made for a detailed description of this means to our Patent No.2,039,371. It is sulficient for the purposes of this application todescribe the means 23 for imparting longitudinal `movement of the bolt2| as comprising a bridge member 54 having a transverse body portion 55provided at each end thereof with a pressure foot 56 adapted to engagean outer surface 51 of the pump body so that the body portion 55 is ex-Utended across the bore I2 substantially in the cally mounted about thebolt 2| and isA provided Y ally disposed ribs 4 5 formed integrally withand projecting longitudinally outwardly from the body of the nut 38, andis provided at its outer end with handles-41 which are rigidly securedvto the wrench 43 and the sleeve 43a which is rotatably mounted upon thebolt 2|.

A collar 48 is rigidly secured in Vfixed position upon the bolt 2| atsuch a position therealong that it is spaced a short distance from a hubportion 49 of reduced diameter of the nut 38. This collar 48 affords ashoulder for positively' stopping movement of the nut 38 along the bolt2|. Otherwise as the nut 38 isr rotated with respect to the bolt 2| in amanner to cause it to move upward to the end of the threaded portion ofthe bolt 2| the threads of the nut might become jammed on the unthreadedportion of the bolt 2| and be difficult to dislodge for a subsequentmovement downward on the bolt 2|.

The radial distance between the bore faces 53 of the outer or upper endportions of the segmental grips 29 and the bolt 2| is less than thedepth of that portion of the flange 42 which is radially inside the rimfaces 34 of the segmental Y grips 29 when the latter are in operativeposition of engagement with the liner I3. The: radial distance betweenthe bore faces 53 and` the' bolt 2| is somewhat greater than thethickness ofthe liner to be pulled. It follows from these. relationshipsthat when the nut 38 is withdrawn longitudinally of thev bolt 2| asufficient distance from the nut 24 to enable the. bore faces 53 of thesegments 29 to be moved radially into contact with the bolt 2| theentire pulling structure 29 can be inserted within. the bore I4 but thatthe several segments willbeheldrin assembled. relationship with respectto the bolt 2| and. nuts 24 and 38 by reason of the engagement. of theflange 42 with the slots 31 ofthe segments. 'I'.o -disassemble thesegments 29 the cotter pinY 28 is removed, the nut 24 is unscrewed fromthe bolt 2| and the nut 38 is moved downward of the bolt 2| at least toa point at which its face 39 Vis flush with the lower end ofthe bolty2|.. The segments 29 can then be moved radially inwardly to clear theinner edge 52 of the iiange 42.

Our invention includes in combination with the pulling mechanism 20 themeans 23 for moving the bolt 2| longitudinally of the cylinder bore I4for operation of the pulling mechanism 20 to pull the liner I3 from thebore I 2.. The

means 23 is. arranged andv constructed in substantially the same manneras that shown and describedin our Patent No. 2,039,311.V

manner shown in Fig. 1, a nut 58 having threaded engagement with thebolt 2|, and a roller thrust bearing 59 `interposed .between the nut 58and the transverse body portion 55 of the bridge member 54.

In the operation of the device, the position of the nut 24 on the bolt2| is regulated by means of the cotter pin` 28 so that when the nut 38is at its eXtreme outer position along the bolt 2| Ain which it is incontact with the collar 48,the segmental gripsl 29 are free to moveinwardly toward each other sufficiently that their shoulders 35 areinside-the liner bore I4. 'Ihe grips `are held in assembled relationshipwith each other and the otherv parts of the device by the flange 42,stem 2|, and nut 24 for all positions of the nut 38 and of the socketwrench 43 by which the nut is operated.

With the nut V38 in its outermost position -against the stop 48 and withthe segmental grips 29' consequently at their radially innermostposition, the entire pulling mechanism 29 is inserted within the bore I4of the liner I3 until the shoulders 35 of the segmental grips 29 havemoved beyond and inside the inner end of the liner I3. TheV socketwrench' 43 is then turned in a direction to move the nut 38 and thesegmental grips 29 inwardly along the bolt 2|. The grips 29 by reason ofthe engagement of their conical bore surfaces with the nut 24 areexpanded radially outwardly as they are moved longitudinally inwardly ofthe bolt 2 I. When the rim surfaces 32 of the grips 29 contact the innerbore surface I4' of the liner I3', the bolt 2| and pulling assembly 28are moved longitudinally outwardly until the shoulders 35 engage theinner end surface of the liner I3. The bridge member 54 and nut 58 arethen placed in position, and the nut 58A rotated, with the result thatthe bolt 2|, pulling means 28, and liner I3 are withdrawn by a forcesufficient to overcome the forced lit of theliner I3 within the cylinderbore.

We havedescribed herein one embodiment of our invention, but it iscapable of many other embodiments which come within' the' terms of theappended claims.

We claim as our invention:

l. In a device for pulling. an insert sleeve from a bore, thecombination of: a stern adapted to be extended inwardly of said bore;meansassociated with said stem for moving it longitudinally outwardly ofsaid bore; a plurality ofannularly dis- ;posed segmental grip memberseach provided with a shoulder at one end for engagement with the innerend face of theinsert sleeve, and each having a conical bore facedirected inwardly o'f said bore, a portion of reduced diameter extendingfrom the end face opposite said shoulder end, and an outwardly facingannular groove between said portion ofV reduced diameter and theremainder of said grip'; a grip expander threaded upon said stem havinga conical rim face mating Since the invention which isY the subject `of75 .with said conical bore faces; an adjustingv nut threaded on saidstem having an endwise engagement with said grip members for expandingsaid grip members on said mating conical faces; an integral web carriedby said adjusting nut encompassing said reduced portion; an integral,inwardly extending, annular flange carried by said web, projecting intosaid groove and adapted to hold said adjusting nut and grips inassembled j relationship longitudinally and radially when said'nut andgrips are in assembled position on said stem; and a stop limitingthreaded movement of said grip expander away from said adjusting nut.

2. In a device for pulling an insert sleeve from a bore, the combinationof: a stem adapted to be extended inwardly of said bore; meansassociated with said stem for moving it longitudinally outwardly of saidbore; a plurality of annularly disposed segmental grip members eachprovided with a shoulder at one end for engagement with the inner endface of the insert sleeve, and each having a cylindrical peripheral facefor engagement with the bore face of the insert sleeve and each having aconical bore face directed outwardly of said bore; a grip expanderthreaded nut for relatively longitudinal movement at a radial positionof said grip members centrally inside of said stem contacting position;and a re-v movable stop limiting movement of said grip ex'- pander awayfrom said adjusting nut.

3. In a device for pullingan insert sleeve from Y a bore, thecombination of: a stem adapted-to be extended inwardly ofthe bore; meansassociated with said stem'fcr moving it longitudinally outupon said stemand having a conical peripheral Y face mating with said conical borefaces; an adjusting nut threaded on said stem and having endwiseengagement with said grip members for expanding said grip members onsaid vmating conical faces to move said cylindrical peripheral facesinto engagement with the bore face of the wardly of the bore; aplurality of annularly disposed segmental grip members, each providedwith a shoulder for engagement with the inner end face of the insertsleeve, with a cylindrical rim face shaped for solid, axially extendedengagement with the bore face of the insert sleeve; and with a conicalbore face set at an angle to the axis of said rim face and tapering awayfrom said axis in a direction outwardly of said bore;

Y a grip expander secured upon said stem having a conical rim faceforming an angle with the axis cf the bore of the same degree as saidfirst-mentioned angle, whereby said grip member may simultaneouslysolidly engage both the insert Y sleeve bore face and said expander rimface for a` substantial distance axially of said grip member ;V

- to said stem.

and releasing said grip members and adjusting Y CLARENCE VSH-IITE.`OLIVER B. GRAHAM.

